How to install Office 2010, 2013, 2016 & maybe 2019 side by side on same Win 8.1 for comparison? - I know Outlook does not allow from multiple Generations so that's fine. - Also aware that of some side by side articles of 2 Generations of Office possible. Wondering if ALL are possible or certain combinations are / versus not? PPS: Once installed could they be activated via KMS? Even if not thats fine as its a TEST to check & compare some stuff.